Azo dye.



TlON ()h HERMAN Y.

AZO DYE.

Specification of Letters Patent.

Patented May 11, 1909.

Application filed February 11, 1909. Serial No. 477,284.

To all whom it may concern:

Be it known that we, OsoAn (liiN'rnnii. and LEOPOLD HESSE, doctors of pl]llUSO1)ll Y, chemists, citizens of the German Empire, rcsiding at Elberfeld, Germany, Kingdom of Prussia, have invented new and useful Tin-- rovements in New Azo Dyes, of which the ollowing is a specification.

Our invention relates to the manufacture and production of new coloring matters capable of dyeing wool.

The new dyestuffs are obtained by combining in acid solution the diazocompound of para nitranilin ortho sulfonic acid with naphthalene compounds having the formula men 2 (R meaning hydrogen or a substituent, X andY meaning hydrogen of a sulfonic grou The new products possess the value le pro erty that they produce on wool pure vio et to black shades fast to light and to Washing and possessing excellent leveldyeing pro erties.

T e new dyestuifs are after being dried and pulverized in the shape of their alkaline salts dark powders soluble in Water generally with a red to violet color. The yield uvon reduction with stannous chlori and h drochloric acid para-phenylenediamin-su fonic acid and naphthalene diamins having the general formula:

(X, Y and R having the above given mean- Tn carrying out our new process practically we can proceed as follows, the parts being by Wei ht:

xample.-235 arts of para-nitranilin-ortho-sulfonic acid ammonium salt) are diazotized b means of 69 parts of sodium nitrite an 550 parts of a 20 per cent. hydrochloric acid, the diazocompound is introduced into a suspension of 239 parts of 2.8-

aminonaphtliol (3 sulfonic acid showing slightly acid reaction. The dycstufl is precipitatcd by the addition of common salt, filtered oil and. dried. It is in the shape of its sodium salt a reddish-brown powder solublc in water with a reddish-violet color and soluble in com cntratvd sulfuric acid with an orange color. The new (lye yields upon reduction with stannous chlorids and hydrochloric acid para-phenylene-diaminsulfonic acid and ].2-diamino-S-naphthohfi-sulfonic acid. It dyes wool reddish-violet shades fast to light and to washing.

I n the following table the shades of some of the new dyes are given:

Dyestufl obtained from mra-nilranilin-orl v thosulfonic acid+ D3 05 Wool 2.8-aminonaphtho] i Reddishblue.

2-8-aininonaphthol-fi sulionic acid Reddisliviolet.

acid. 2.23amincnaphth0l-3.6-disulfonic acid Violet.

Having now described our invention and in what manner the same is to be performed, what we claim as new and desire to secure by Letters Patent is:-

1. The herein-described new azodyestufl's, obtainable from para-nitranilin-ortho-sulfonic acid and naphthalene com ounds of the above iven formula in acid so ution, which dyestu s are, after being dried and pulverized in the shape of their alkaline salts dark powders soluble in water generally with a red to violet color; yielding upon reduction with stannous chlorid and hydrochloric acid paraphenylenediamin-sulfonic acid and diamino naphthols having the above given formula; and dyein wool from violet to black shades, substantiafily as described.

2. The herein-described new azod estuif, obtainable from para-nitranilin-ort o-sulfonic acid and 2.8-aminonaphthol-fi-sulfonic acid in acid solution, which dyestuif is, after being dried and pulverized in the shape of its sodium salt a reddish-brown powder soluble in water with. a reddish-violet color and solublc in concentrated sulfuric acid with an orange color; yielding upon reduction with our hands in the presence of two subscribing stennous chlorid end hydrochloric eeld parawitnesses.

phenylenediemin-sulfoni0 acid end 1.2-di-j OSCAR GUNTHER. [L. 5.]

amino-S-naphthol-fi-sulfonic acid; and dye- LEOPOLD HESSE. [L. s] 5 ing wool reddish-violet shades fast to light Witnesses:

and to washing, substantially as described. 1 OTTO Komu,

In testimony whereof we have hereunto set i H. KiJPPER. 

